/**
 * ���乤����
 */
package indi.zjh.dp.util;

/* 
 * Copyright 2002-2014 the original author or authors. 
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */  

  
import indi.zjh.dp.startup.Constant;

import java.lang.reflect.Constructor;  
import java.lang.reflect.Field;  
import java.lang.reflect.InvocationTargetException;  
import java.lang.reflect.Method;  
import java.lang.reflect.Modifier;  
import java.lang.reflect.UndeclaredThrowableException;  
import java.sql.SQLException;  
import java.util.ArrayList;  
import java.util.Arrays;  
import java.util.List;
import java.util.Vector;
import java.util.regex.Pattern;
  
/** 
 * Simple utility class for working with the reflection API and handling 
 * reflection exceptions. 
 * 
 * <p>Only intended for internal use. 
 * 
 * @author Juergen Hoeller 
 * @author Rob Harrop 
 * @author Rod Johnson 
 * @author Costin Leau 
 * @author Sam Brannen 
 * @author Chris Beams 
 * @since 1.2.2 
 */  
public abstract class ReflectionUtil {  
  
    /** 
     * Pattern for detecting CGLIB-renamed methods. 
     * @see #isCglibRenamedMethod 
     */  
    private static final Pattern CGLIB_RENAMED_METHOD_PATTERN = Pattern.compile("CGLIB\\$(.+)\\$\\d+");  
  
  
    /** 
     * Attempt to find a {@link Field field} on the supplied {@link Class} with the 
     * supplied {@code name}. Searches all superclasses up to {@link Object}. 
     * @param clazz the class to introspect 
     * @param name the name of the field 
     * @return the corresponding Field object, or {@code null} if not found 
     */  
    public static Field findField(Class<?> clazz, String name) {  
        return findField(clazz, name, null);  
    }  
    
    /**
     * ��ȡָ����������ֶΣ� ��������
     * @param clazz
     * @return
     * @throws ClassNotFoundException
     */
    public static Field[] getAllFields(Class<?> clazz) throws ClassNotFoundException
    {
    	Vector<Field> fields = new Vector<Field>();
    	
    	Field[] theFields = clazz.getDeclaredFields();
    	for(int i = 0; i < theFields.length; ++i)
    	{
    		fields.add(theFields[i]);
    	}
    	
    	Class<?> supperClass = clazz.getSuperclass();
    	
    	if(supperClass.getName().equals(Constant.BUSINESS_BASE_CLASS_NAME))
    	{
    		Class<?> busiClass = Class.forName(Constant.BUSINESS_BASE_CLASS_NAME);
    		Field[] sFields = busiClass.getDeclaredFields();
    		for(int i = 0; i < sFields.length; ++i)
    		{
    			fields.add(sFields[i]);
    		}
    	}
    	else
    	{
    		Field[] sFields = getAllFields(supperClass);
    		for(int i = 0; i < sFields.length; ++i)
    		{
    			fields.add(sFields[i]);
    		}
    	}
    	
    	return (Field[])fields.toArray(theFields);
    }
  
    /** 
     * Attempt to find a {@link Field field} on the supplied {@link Class} with the 
     * supplied {@code name} and/or {@link Class type}. Searches all superclasses 
     * up to {@link Object}. 
     * @param clazz the class to introspect 
     * @param name the name of the field (may be {@code null} if type is specified) 
     * @param type the type of the field (may be {@code null} if name is specified) 
     * @return the corresponding Field object, or {@code null} if not found 
     */  
    
    public static Field findField(Class<?> clazz, String name, Class<?> type) {  
        //Assert.notNull(clazz, "Class must not be null");  
        //Assert.isTrue(name != null || type != null, "Either name or type of the field must be specified");  
        Class<?> searchType = clazz;  
        while (!Object.class.equals(searchType) && searchType != null) {  
            Field[] fields = searchType.getDeclaredFields();  
            for (Field field : fields) {  
                if ((name == null || name.equals(field.getName())) && (type == null || type.equals(field.getType()))) {  
                    return field;  
                }  
            }  
            searchType = searchType.getSuperclass();  
        }  
        return null;  
    }  
  
    /** 
     * Set the field represented by the supplied {@link Field field object} on the 
     * specified {@link Object target object} to the specified {@code value}. 
     * In accordance with {@link Field#set(Object, Object)} semantics, the new value 
     * is automatically unwrapped if the underlying field has a primitive type. 
     * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}. 
     * @param field the field to set 
     * @param target the target object on which to set the field 
     * @param value the value to set; may be {@code null} 
     */  
    public static void setField(Field field, Object target, Object value) {  
        try {  
            field.set(target, value);  
        }  
        catch (IllegalAccessException ex) {  
            handleReflectionException(ex);  
            throw new IllegalStateException(  
                    "Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());  
        }  
    }  
  
    /** 
     * Get the field represented by the supplied {@link Field field object} on the 
     * specified {@link Object target object}. In accordance with {@link Field#get(Object)} 
     * semantics, the returned value is automatically wrapped if the underlying field 
     * has a primitive type. 
     * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException(Exception)}. 
     * @param field the field to get 
     * @param target the target object from which to get the field 
     * @return the field's current value 
     */  
    public static Object getField(Field field, Object target) {  
        try {  
            return field.get(target);  
        }  
        catch (IllegalAccessException ex) {  
            handleReflectionException(ex);  
            throw new IllegalStateException(  
                    "Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());  
        }  
    }  
  
    /** 
     * Attempt to find a {@link Method} on the supplied class with the supplied name 
     * and no parameters. Searches all superclasses up to {@code Object}. 
     * <p>Returns {@code null} if no {@link Method} can be found. 
     * @param clazz the class to introspect 
     * @param name the name of the method 
     * @return the Method object, or {@code null} if none found 
     */  
    public static Method findMethod(Class<?> clazz, String name) {  
        return findMethod(clazz, name, new Class<?>[0]);  
    }  
  
    /** 
     * Attempt to find a {@link Method} on the supplied class with the supplied name 
     * and parameter types. Searches all superclasses up to {@code Object}. 
     * <p>Returns {@code null} if no {@link Method} can be found. 
     * @param clazz the class to introspect 
     * @param name the name of the method 
     * @param paramTypes the parameter types of the method 
     * (may be {@code null} to indicate any signature) 
     * @return the Method object, or {@code null} if none found 
     */  
    public static Method findMethod(Class<?> clazz, String name, Class<?>... paramTypes) {  
        //Assert.notNull(clazz, "Class must not be null");  
        //Assert.notNull(name, "Method name must not be null");  
        Class<?> searchType = clazz;  
        while (searchType != null) {  
            Method[] methods = (searchType.isInterface() ? searchType.getMethods() : searchType.getDeclaredMethods());  
            for (Method method : methods) {  
                if (name.equals(method.getName()) &&  
                        (paramTypes == null || Arrays.equals(paramTypes, method.getParameterTypes()))) {  
                    return method;  
                }  
            }  
            searchType = searchType.getSuperclass();  
        }  
        return null;  
    }  
  
    /** 
     * Invoke the specified {@link Method} against the supplied target object with no arguments. 
     * The target object can be {@code null} when invoking a static {@link Method}. 
     * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}. 
     * @param method the method to invoke 
     * @param target the target object to invoke the method on 
     * @return the invocation result, if any 
     * @see #invokeMethod(java.lang.reflect.Method, Object, Object[]) 
     */  
    public static Object invokeMethod(Method method, Object target) {  
        return invokeMethod(method, target, new Object[0]);  
    }  
  
    /** 
     * Invoke the specified {@link Method} against the supplied target object with the 
     * supplied arguments. The target object can be {@code null} when invoking a 
     * static {@link Method}. 
     * <p>Thrown exceptions are handled via a call to {@link #handleReflectionException}. 
     * @param method the method to invoke 
     * @param target the target object to invoke the method on 
     * @param args the invocation arguments (may be {@code null}) 
     * @return the invocation result, if any 
     */  
    public static Object invokeMethod(Method method, Object target, Object... args) {  
        try {  
            return method.invoke(target, args);  
        }  
        catch (Exception ex) {  
            handleReflectionException(ex);  
        }  
        throw new IllegalStateException("Should never get here");  
    }  
  
    /** 
     * Invoke the specified JDBC API {@link Method} against the supplied target 
     * object with no arguments. 
     * @param method the method to invoke 
     * @param target the target object to invoke the method on 
     * @return the invocation result, if any 
     * @throws SQLException the JDBC API SQLException to rethrow (if any) 
     * @see #invokeJdbcMethod(java.lang.reflect.Method, Object, Object[]) 
     */  
    public static Object invokeJdbcMethod(Method method, Object target) throws SQLException {  
        return invokeJdbcMethod(method, target, new Object[0]);  
    }  
  
    /** 
     * Invoke the specified JDBC API {@link Method} against the supplied target 
     * object with the supplied arguments. 
     * @param method the method to invoke 
     * @param target the target object to invoke the method on 
     * @param args the invocation arguments (may be {@code null}) 
     * @return the invocation result, if any 
     * @throws SQLException the JDBC API SQLException to rethrow (if any) 
     * @see #invokeMethod(java.lang.reflect.Method, Object, Object[]) 
     */  
    public static Object invokeJdbcMethod(Method method, Object target, Object... args) throws SQLException {  
        try {  
            return method.invoke(target, args);  
        }  
        catch (IllegalAccessException ex) {  
            handleReflectionException(ex);  
        }  
        catch (InvocationTargetException ex) {  
            if (ex.getTargetException() instanceof SQLException) {  
                throw (SQLException) ex.getTargetException();  
            }  
            handleInvocationTargetException(ex);  
        }  
        throw new IllegalStateException("Should never get here");  
    }  
  
    /** 
     * Handle the given reflection exception. Should only be called if no 
     * checked exception is expected to be thrown by the target method. 
     * <p>Throws the underlying RuntimeException or Error in case of an 
     * InvocationTargetException with such a root cause. Throws an 
     * IllegalStateException with an appropriate message else. 
     * @param ex the reflection exception to handle 
     */  
    public static void handleReflectionException(Exception ex) {  
        if (ex instanceof NoSuchMethodException) {  
            throw new IllegalStateException("Method not found: " + ex.getMessage());  
        }  
        if (ex instanceof IllegalAccessException) {  
            throw new IllegalStateException("Could not access method: " + ex.getMessage());  
        }  
        if (ex instanceof InvocationTargetException) {  
            handleInvocationTargetException((InvocationTargetException) ex);  
        }  
        if (ex instanceof RuntimeException) {  
            throw (RuntimeException) ex;  
        }  
        throw new UndeclaredThrowableException(ex);  
    }  
  
    /** 
     * Handle the given invocation target exception. Should only be called if no 
     * checked exception is expected to be thrown by the target method. 
     * <p>Throws the underlying RuntimeException or Error in case of such a root 
     * cause. Throws an IllegalStateException else. 
     * @param ex the invocation target exception to handle 
     */  
    public static void handleInvocationTargetException(InvocationTargetException ex) {  
        rethrowRuntimeException(ex.getTargetException());  
    }  
  
    /** 
     * Rethrow the given {@link Throwable exception}, which is presumably the 
     * <em>target exception</em> of an {@link InvocationTargetException}. Should 
     * only be called if no checked exception is expected to be thrown by the 
     * target method. 
     * <p>Rethrows the underlying exception cast to an {@link RuntimeException} or 
     * {@link Error} if appropriate; otherwise, throws an 
     * {@link IllegalStateException}. 
     * @param ex the exception to rethrow 
     * @throws RuntimeException the rethrown exception 
     */  
    public static void rethrowRuntimeException(Throwable ex) {  
        if (ex instanceof RuntimeException) {  
            throw (RuntimeException) ex;  
        }  
        if (ex instanceof Error) {  
            throw (Error) ex;  
        }  
        throw new UndeclaredThrowableException(ex);  
    }  
  
    /** 
     * Rethrow the given {@link Throwable exception}, which is presumably the 
     * <em>target exception</em> of an {@link InvocationTargetException}. Should 
     * only be called if no checked exception is expected to be thrown by the 
     * target method. 
     * <p>Rethrows the underlying exception cast to an {@link Exception} or 
     * {@link Error} if appropriate; otherwise, throws an 
     * {@link IllegalStateException}. 
     * @param ex the exception to rethrow 
     * @throws Exception the rethrown exception (in case of a checked exception) 
     */  
    public static void rethrowException(Throwable ex) throws Exception {  
        if (ex instanceof Exception) {  
            throw (Exception) ex;  
        }  
        if (ex instanceof Error) {  
            throw (Error) ex;  
        }  
        throw new UndeclaredThrowableException(ex);  
    }  
  
    /** 
     * Determine whether the given method explicitly declares the given 
     * exception or one of its superclasses, which means that an exception of 
     * that type can be propagated as-is within a reflective invocation. 
     * @param method the declaring method 
     * @param exceptionType the exception to throw 
     * @return {@code true} if the exception can be thrown as-is; 
     * {@code false} if it needs to be wrapped 
     */  
    public static boolean declaresException(Method method, Class<?> exceptionType) {  
        //Assert.notNull(method, "Method must not be null");  
        Class<?>[] declaredExceptions = method.getExceptionTypes();  
        for (Class<?> declaredException : declaredExceptions) {  
            if (declaredException.isAssignableFrom(exceptionType)) {  
                return true;  
            }  
        }  
        return false;  
    }  
  
    /** 
     * Determine whether the given field is a "public static final" constant. 
     * @param field the field to check 
     */  
    public static boolean isPublicStaticFinal(Field field) {  
        int modifiers = field.getModifiers();  
        return (Modifier.isPublic(modifiers) && Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers));  
    }  
  
    /** 
     * Determine whether the given method is an "equals" method. 
     * @see java.lang.Object#equals(Object) 
     */  
    public static boolean isEqualsMethod(Method method) {  
        if (method == null || !method.getName().equals("equals")) {  
            return false;  
        }  
        Class<?>[] paramTypes = method.getParameterTypes();  
        return (paramTypes.length == 1 && paramTypes[0] == Object.class);  
    }  
  
    /** 
     * Determine whether the given method is a "hashCode" method. 
     * @see java.lang.Object#hashCode() 
     */  
    public static boolean isHashCodeMethod(Method method) {  
        return (method != null && method.getName().equals("hashCode") && method.getParameterTypes().length == 0);  
    }  
  
    /** 
     * Determine whether the given method is a "toString" method. 
     * @see java.lang.Object#toString() 
     */  
    public static boolean isToStringMethod(Method method) {  
        return (method != null && method.getName().equals("toString") && method.getParameterTypes().length == 0);  
    }  
  
    /** 
     * Determine whether the given method is originally declared by {@link java.lang.Object}. 
     */  
    public static boolean isObjectMethod(Method method) {  
        if (method == null) {  
            return false;  
        }  
        try {  
            Object.class.getDeclaredMethod(method.getName(), method.getParameterTypes());  
            return true;  
        }  
        catch (Exception ex) {  
            return false;  
        }  
    }  
  
    /** 
     * Determine whether the given method is a CGLIB 'renamed' method, 
     * following the pattern "CGLIB$methodName$0". 
     * @param renamedMethod the method to check 
     * @see org.springframework.cglib.proxy.Enhancer#rename 
     */  
    public static boolean isCglibRenamedMethod(Method renamedMethod) {  
        return CGLIB_RENAMED_METHOD_PATTERN.matcher(renamedMethod.getName()).matches();  
    }  
  
    /** 
     * Make the given field accessible, explicitly setting it accessible if 
     * necessary. The {@code setAccessible(true)} method is only called 
     * when actually necessary, to avoid unnecessary conflicts with a JVM 
     * SecurityManager (if active). 
     * @param field the field to make accessible 
     * @see java.lang.reflect.Field#setAccessible 
     */  
    public static void makeAccessible(Field field) {  
        if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) ||  
                Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) {  
            field.setAccessible(true);  
        }  
    }  
  
    /** 
     * Make the given method accessible, explicitly setting it accessible if 
     * necessary. The {@code setAccessible(true)} method is only called 
     * when actually necessary, to avoid unnecessary conflicts with a JVM 
     * SecurityManager (if active). 
     * @param method the method to make accessible 
     * @see java.lang.reflect.Method#setAccessible 
     */  
    public static void makeAccessible(Method method) {  
        if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))  
                && !method.isAccessible()) {  
            method.setAccessible(true);  
        }  
    }  
  
    /** 
     * Make the given constructor accessible, explicitly setting it accessible 
     * if necessary. The {@code setAccessible(true)} method is only called 
     * when actually necessary, to avoid unnecessary conflicts with a JVM 
     * SecurityManager (if active). 
     * @param ctor the constructor to make accessible 
     * @see java.lang.reflect.Constructor#setAccessible 
     */  
    public static void makeAccessible(Constructor<?> ctor) {  
        if ((!Modifier.isPublic(ctor.getModifiers()) || !Modifier.isPublic(ctor.getDeclaringClass().getModifiers()))  
                && !ctor.isAccessible()) {  
            ctor.setAccessible(true);  
        }  
    }  
  
    /** 
     * Perform the given callback operation on all matching methods of the given 
     * class and superclasses. 
     * <p>The same named method occurring on subclass and superclass will appear 
     * twice, unless excluded by a {@link MethodFilter}. 
     * @param clazz class to start looking at 
     * @param mc the callback to invoke for each method 
     * @see #doWithMethods(Class, MethodCallback, MethodFilter) 
     */  
    public static void doWithMethods(Class<?> clazz, MethodCallback mc) throws IllegalArgumentException {  
        doWithMethods(clazz, mc, null);  
    }  
  
    /** 
     * Perform the given callback operation on all matching methods of the given 
     * class and superclasses (or given interface and super-interfaces). 
     * <p>The same named method occurring on subclass and superclass will appear 
     * twice, unless excluded by the specified {@link MethodFilter}. 
     * @param clazz class to start looking at 
     * @param mc the callback to invoke for each method 
     * @param mf the filter that determines the methods to apply the callback to 
     */  
    public static void doWithMethods(Class<?> clazz, MethodCallback mc, MethodFilter mf)  
            throws IllegalArgumentException {  
  
        // Keep backing up the inheritance hierarchy.  
        Method[] methods = clazz.getDeclaredMethods();  
        for (Method method : methods) {  
            if (mf != null && !mf.matches(method)) {  
                continue;  
            }  
            try {  
                mc.doWith(method);  
            }  
            catch (IllegalAccessException ex) {  
                throw new IllegalStateException("Shouldn't be illegal to access method '" + method.getName()  
                        + "': " + ex);  
            }  
        }  
        if (clazz.getSuperclass() != null) {  
            doWithMethods(clazz.getSuperclass(), mc, mf);  
        }  
        else if (clazz.isInterface()) {  
            for (Class<?> superIfc : clazz.getInterfaces()) {  
                doWithMethods(superIfc, mc, mf);  
            }  
        }  
    }  
  
    /** 
     * Get all declared methods on the leaf class and all superclasses. Leaf 
     * class methods are included first. 
     */  
    public static Method[] getAllDeclaredMethods(Class<?> leafClass) throws IllegalArgumentException {  
        final List<Method> methods = new ArrayList<Method>(32);  
        doWithMethods(leafClass, new MethodCallback() {  
            public void doWith(Method method) {  
                methods.add(method);  
            }  
        });  
        return methods.toArray(new Method[methods.size()]);  
    }  
  
    /** 
     * Get the unique set of declared methods on the leaf class and all superclasses. Leaf 
     * class methods are included first and while traversing the superclass hierarchy any methods found 
     * with signatures matching a method already included are filtered out. 
     */  
    public static Method[] getUniqueDeclaredMethods(Class<?> leafClass) throws IllegalArgumentException {  
        final List<Method> methods = new ArrayList<Method>(32);  
        doWithMethods(leafClass, new MethodCallback() {  
            public void doWith(Method method) {  
                boolean knownSignature = false;  
                Method methodBeingOverriddenWithCovariantReturnType = null;  
                for (Method existingMethod : methods) {  
                    if (method.getName().equals(existingMethod.getName()) &&  
                            Arrays.equals(method.getParameterTypes(), existingMethod.getParameterTypes())) {  
                        // Is this a covariant return type situation?  
                        if (existingMethod.getReturnType() != method.getReturnType() &&  
                                existingMethod.getReturnType().isAssignableFrom(method.getReturnType())) {  
                            methodBeingOverriddenWithCovariantReturnType = existingMethod;  
                        }  
                        else {  
                            knownSignature = true;  
                        }  
                        break;  
                    }  
                }  
                if (methodBeingOverriddenWithCovariantReturnType != null) {  
                    methods.remove(methodBeingOverriddenWithCovariantReturnType);  
                }  
                if (!knownSignature && !isCglibRenamedMethod(method)) {  
                    methods.add(method);  
                }  
            }  
        });  
        return methods.toArray(new Method[methods.size()]);  
    }  
  
    /** 
     * Invoke the given callback on all fields in the target class, going up the 
     * class hierarchy to get all declared fields. 
     * @param clazz the target class to analyze 
     * @param fc the callback to invoke for each field 
     */  
    public static void doWithFields(Class<?> clazz, FieldCallback fc) throws IllegalArgumentException {  
        doWithFields(clazz, fc, null);  
    }  
  
    /** 
     * Invoke the given callback on all fields in the target class, going up the 
     * class hierarchy to get all declared fields. 
     * @param clazz the target class to analyze 
     * @param fc the callback to invoke for each field 
     * @param ff the filter that determines the fields to apply the callback to 
     */  
    public static void doWithFields(Class<?> clazz, FieldCallback fc, FieldFilter ff)  
            throws IllegalArgumentException {  
  
        // Keep backing up the inheritance hierarchy.  
        Class<?> targetClass = clazz;  
        do {  
            Field[] fields = targetClass.getDeclaredFields();  
            for (Field field : fields) {  
                // Skip static and final fields.  
                if (ff != null && !ff.matches(field)) {  
                    continue;  
                }  
                try {  
                    fc.doWith(field);  
                }  
                catch (IllegalAccessException ex) {  
                    throw new IllegalStateException(  
                            "Shouldn't be illegal to access field '" + field.getName() + "': " + ex);  
                }  
            }  
            targetClass = targetClass.getSuperclass();  
        }  
        while (targetClass != null && targetClass != Object.class);  
    }  
  
    /** 
     * Given the source object and the destination, which must be the same class 
     * or a subclass, copy all fields, including inherited fields. Designed to 
     * work on objects with public no-arg constructors. 
     * @throws IllegalArgumentException if the arguments are incompatible 
     */  
    public static void shallowCopyFieldState(final Object src, final Object dest) throws IllegalArgumentException {  
        if (src == null) {  
            throw new IllegalArgumentException("Source for field copy cannot be null");  
        }  
        if (dest == null) {  
            throw new IllegalArgumentException("Destination for field copy cannot be null");  
        }  
        if (!src.getClass().isAssignableFrom(dest.getClass())) {  
            throw new IllegalArgumentException("Destination class [" + dest.getClass().getName()  
                    + "] must be same or subclass as source class [" + src.getClass().getName() + "]");  
        }  
        doWithFields(src.getClass(), new FieldCallback() {  
            public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException {  
                makeAccessible(field);  
                Object srcValue = field.get(src);  
                field.set(dest, srcValue);  
            }  
        }, COPYABLE_FIELDS);  
    }  
  
  
    /** 
     * Action to take on each method. 
     */  
    public interface MethodCallback {  
  
        /** 
         * Perform an operation using the given method. 
         * @param method the method to operate on 
         */  
        void doWith(Method method) throws IllegalArgumentException, IllegalAccessException;  
    }  
  
  
    /** 
     * Callback optionally used to filter methods to be operated on by a method callback. 
     */  
    public interface MethodFilter {  
  
        /** 
         * Determine whether the given method matches. 
         * @param method the method to check 
         */  
        boolean matches(Method method);  
    }  
  
  
    /** 
     * Callback interface invoked on each field in the hierarchy. 
     */  
    public interface FieldCallback {  
  
        /** 
         * Perform an operation using the given field. 
         * @param field the field to operate on 
         */  
        void doWith(Field field) throws IllegalArgumentException, IllegalAccessException;  
    }  
  
  
    /** 
     * Callback optionally used to filter fields to be operated on by a field callback. 
     */  
    public interface FieldFilter {  
  
        /** 
         * Determine whether the given field matches. 
         * @param field the field to check 
         */  
        boolean matches(Field field);  
    }  
  
  
    /** 
     * Pre-built FieldFilter that matches all non-static, non-final fields. 
     */  
    public static FieldFilter COPYABLE_FIELDS = new FieldFilter() {  
  
        public boolean matches(Field field) {  
            return !(Modifier.isStatic(field.getModifiers()) || Modifier.isFinal(field.getModifiers()));  
        }  
    };  
  
  
    /** 
     * Pre-built MethodFilter that matches all non-bridge methods. 
     */  
    public static MethodFilter NON_BRIDGED_METHODS = new MethodFilter() {  
  
        public boolean matches(Method method) {  
            return !method.isBridge();  
        }  
    };  
  
  
    /** 
     * Pre-built MethodFilter that matches all non-bridge methods 
     * which are not declared on {@code java.lang.Object}. 
     */  
    public static MethodFilter USER_DECLARED_METHODS = new MethodFilter() {  
  
        public boolean matches(Method method) {  
            return (!method.isBridge() && method.getDeclaringClass() != Object.class);  
        }  
    };  
  
}  
